@misc{indiciaecf6bcb9242ac,
  title = {Geochemical survey of the Chattahoochee Roadless Area, Towns, Union, and White counties, Georgia},
  author = {Robert P. Koeppen and Arthur E. Nelson},
  year = {1989},
  doi = {10.3133/mf1502b},
  url = {https://pubs.usgs.gov/publication/mf1502B},
  note = {Source identifier: mf1502B}
}